John _________ a doctor when he _________ up

I like this pair of trousers a lot. Can I ________? －Yes, of course,

The movie is about a true story ______ happened in Tang Shan in 1976.

Millie, here is _____ bridge. What can you see across _____bridge?—Oh, _____elephant is standing over there.

My sister often helps me _____ my English. [ ]